{
  "threat_severity" : "Moderate",
  "public_date" : "2021-08-17T00:00:00Z",
  "bugzilla" : {
    "description" : "haproxy: it can lead to a situation with an attacker-controlled HTTP Host header because a mismatch between Host and authority is mishandled",
    "id" : "1995112",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1995112"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-20",
  "details" : [ "An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.", "haproxy was found to be vulnerable to HTTP host header attack: This problem creates a scenario in which it's possible to drop the Host header and use the authority only after forwarding to a\nsecond http2 layer,  possibly causing two differing values of Host at a different stage. The highest threat from this vulnerability is data integrity." ],
  "affected_release" : [ {
    "product_name" : "Red Hat OpenShift Container Platform 4.8",
    "release_date" : "2022-01-05T00:00:00Z",
    "advisory" : "RHSA-2021:5208",
    "cpe" : "cpe:/a:redhat:openshift:4.8::el7",
    "package" : "haproxy-0:2.2.13-2.el7"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4.9",
    "release_date" : "2021-11-10T00:00:00Z",
    "advisory" : "RHSA-2021:4118",
    "cpe" : "cpe:/a:redhat:openshift:4.9::el8",
    "package" : "haproxy-0:2.2.15-2.el8"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "haproxy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "haproxy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "haproxy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "haproxy",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 3.11",
    "fix_state" : "Out of support scope",
    "package_name" : "haproxy",
    "cpe" : "cpe:/a:redhat:openshift:3.11"
  }, {
    "product_name" : "Red Hat Software Collections",
    "fix_state" : "Not affected",
    "package_name" : "rh-haproxy18-haproxy",
    "cpe" : "cpe:/a:redhat:rhel_software_collections:3"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2021-39242\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-39242" ],
  "name" : "CVE-2021-39242",
  "csaw" : false
}